Some of the kids at the school I worked at delighted in switching the 240/110v switch at the back - while it was off of course. They didn’t even have the satisfaction of witnessing the BANG when it was next switched on, because it usually happened next lesson. We had to glue plates over the switches in the end.
In my first week in my first job, I blindly poked around the back of a brand new, freshly unboxed Amstrad PPC with the (live) power cable, looking for the power socket and found a serial port instead. Fortunately I was alone in the room, so I plugged it in properly and innocently announced it DOA.
Biting the hand that feeds IT
